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Otherwise the default log target is the console and we won't use
the journal socket even if it is available.
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When enumerated devices are being processed by udevd, we will receive
corresponding uevents later. So, we should not process devices in that
case.
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storagetm: several trivial fixlets
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To make the hash function consistent with the compare function.
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On MIPS32 OABI, st_rdev is unsigned long, not dev_t. Use a temporary
variable to avoid an incompatible pointer.
Bug: https://bugs.gentoo.org/920576
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=21278
Fixes: https://github.com/systemd/systemd/issues/30626
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To prevent copy-and-paste mistake.
This also introduce in_addr_hash_func().
No functional change, just refactoring.
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As per https://github.com/systemd/systemd/pull/30547#discussion_r1434371627
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To make the generated IDs equivalent when
- sd_device object is not provided,
- sd_device object is provided, but it does not have ID_SERIAL.
Follow-up for abc19a6ffaa94893ffc40cc000e5bb4437f67656.
This also fixes missing voidification.
Fixes CID#1524253.
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don't let the devices to be announced just as model "Linux". Let's instead
propagate the underlying block device's model. Also do something
reasonably smart for the serial and firmware version fields.
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Pretty!
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This implements a "storage target mode", similar to what MacOS provides
since a long time as "Target Disk Mode":
https://en.wikipedia.org/wiki/Target_Disk_Mode
This implementation is relatively simple:
1. a new generic target "storage-target-mode.target" is added, which
when booted into defines the target mode.
2. a small tool and service "systemd-storagetm.service" is added which
exposes a specific device or all devices as NVMe-TCP devices over the
network. NVMe-TCP appears to be hot shit right now how to expose
block devices over the network. And it's really simple to set up via
configs, hence our code is relatively short and neat.
The idea is that systemd-storagetm.target can be extended sooner or
later, for example to expose block devices also as USB mass storage
devices and similar, in case the system has "dual mode" USB controller
that can also work as device, not just as host. (And people could also
plug in sharing as NBD, iSCSI, whatever they want.)
How to use this? Boot into your system with a kernel cmdline of
"rd.systemd.unit=storage-target-mode.target ip=link-local", and you'll see on
screen the precise "nvme connect" command line to make the relevant
block devices available locally on some other machine. This all requires
that the target mode stuff is included in the initrd of course. And the
system will the stay in the initrd forever.
Why bother? Primarily three use-cases:
1. Debug a broken system: with very few dependencies during boot get
access to the raw block device of a broken machine.
2. Migrate from system to another system, by dd'ing the old to the new
directly.
3. Installing an OS remotely on some device (for example via Thunderbolt
networking)
(And there might be more, for example the ability to boot from a
laptop's disk on another system)
Limitations:
1. There's no authentication/encryption. Hence: use this on local links
only.
2. NVMe target mode on Linux supports r/w operation only. Ideally, we'd
have a read-only mode, for security reasons, and default to it.
Future love:
1. We should have another mode, where we simply expose the homed LUKS
home dirs like that.
2. Some lightweight hookup with plymouth, to display a (shortened)
version of the info we write to the console.
To test all this, just run:
mkosi --kernel-command-line-extra="rd.systemd.unit=storage-target-mode.target" qemu
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